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Is it a hot electrical smell, or more like rubber? if rubber, it is probably the "cogged" drive belt. If it is electrical and the older
style speed controller it needs to be repaired. And it most likely
that device has a catch internally supplying more power than normal.
I would be willing to bet it is your electricity or your outlets. First try your machine in a different room in your home. If it still does it then take it to a friends across town. If it works at her house but not yours, you know you have an electricity problem in your house... or the lines coming into your house. Remember these machines need a certain amperes or voltage to work. If they don't get what they need it won't power up.
It could be that your sewing machine just saved your life by pointing out a problem with your electricity... listen to it. ;)
The needle thread breaks
1. the needle thread is not threaded properly
2. The needle thread tension is to tight
3. The needle is bent or blunt
4. The needle is incorrectly inserted
5. The needle thread & the bobbin thread are not set under the presser foot when starting to sew
6. the threads were not drawn to the rear after sewing
7. The thread is either to heavy or to fine for the needle
here's my suggestions change the needle-make sure the needle is inserted correctly into the needle holder & also turned the right way make sure when sewing on the machine that the top thread does not come off the thread take up lever check the top thread tension it may be too tight,, usually 4 is good or if the machine has automatic tension set it there make sure it's the right needle for the machine & make sure it's the right needle for the fabric & thread. some thread is knotty ,,, make sure the thread is good quality
try changing needles clean under the needle plate & in the bobbin area for loose thread or lint make sure the bobbin is inserted into the bobbin case correctly--if the machine won't pick the thread up from the bobbin correctly take the bobbin out of the case & turn it around & try it that way.
I guessing that from what you say broken both needles you are talking about a serger, unless you are using twin needles in a sewing machine if the power has gone off, have you tried turning off the machine & turning it back on, if that doesn't work then it's possible that the power cord may have gone out, or the on & off switch may have gone out. the only things broken needles will do is knock the machine out of time or jam it up